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Title:
The Kinematics of the SN 1987A Beam/Jet(s)
Authors:
Middleditch, John; Perez, M. R.
Affiliation:
AA(LANL), AB(LANL)
Publication:
American Astronomical Society, AAS Meeting #212, #13.05; Bulletin of the American Astronomical Society, Vol. 40, p.206
Publication Date:
05/2008
Origin:
AAS
Bibliographic Code:
2008AAS...212.1305M

Abstract

Early measurements of SN 1987A indicate an intense beam of light and jet of particles which impacted polar ejecta (PE) remaining from the previous binary merger which formed Sk -69 202. The photon beam (aka "enhanced UV flash") scattered off/reprocessed in, without significantly penetrating, the PE, producing 2e39 ergs/s for about a day at day 7.8, the consistent with the delay PREDICTED from the 60 mas offset (17 light-days in projection) of the "Mystery Spot" (MS), and the ring/bipolar geometry. This scattered flux then decayed for a day with a timescale consistent with the UV flash, after which the luminosity rebounded above the day 7.8 value by day 9.8, and continued rising linearly with time, until a decrement of 8e39 ergs/s occurred at day 20, indicating: (1) particles from the jet penetrating into, and eventually through, the PE, with (2) the fastest traveling at 0.9 c, (3) the distance from 87A to the PE was 11 lt-s, (4) its depth was 13-14 lt-s, (5) the BJ angle to the line of sight was 72 degrees, and (6) that both the enhanced flash and jet initially had collimation factors in excess of 10,000. The 45, 60, and 74 mas offsets of the MS at days 30, 38, and 50, indicate the eventual formation of a luminous plume from the less relativistic jet and PE material, initially traveling at >0.5 c, but eventually decelerating to <0.3 c. The implications of a 2nd MS, 160 mas from 87A in the opposite direction, at day 38, and how these early measurements constrain the formation of 99% of millisecond pulsars, gamma-ray bursts and SNe, with the exception of SN 1986J and the more recent and distant SN 2006gy, and the potential for systematic effects in SN Ia cosmology, will be further explored in this poster.
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